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the lib source err

while (button_count--)//botton_count = 4
{
    app_button_cfg_t * p_btn = &p_buttons[button_count];

    nrf_drv_gpiote_in_config_t config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(false);
    config.pull = p_btn->pull_cfg;
    
    err_code = nrf_drv_gpiote_in_init(p_btn->pin_no, &config, gpiote_event_handler);//return //NRF_ERROR_NO_MEM when it is called at the second time,,why ?how can i modify it 
    if (err_code != NRF_SUCCESS)
    {
        return err_code;
    }
}
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